James k



No Model.) J. K. WOOLLEY.v

, UAR -SPRING.

gNo. 321.776. Pafvvemd July 7, 1885.

yam.

Nrrnn STATES JAMES K. VOOLLEY, OF DETROIT, MICHIGAN, ASSIGNOR TO THEDETROIT STEEL AND SPRING WORKS, OF SAME PLACE.

CAR=SPR|NG.

SPECIFICATION forming part of Letters Patent No. 321,776, dated July 7,1885.

Application ied May 13, 1885. (No model.)

To all whom it may concern:

Be it known that I, JAMES K. WooLLnY, of Detroit, in the county of Wayneand State of Michigan, have invented new and useful Improvements inOar-Springs and Housings; and

I do hereby declare that the following is a full,

clear, and exact description thereof, reference being had to theaccompanying drawings, which form a part of this specification.

This invention relates to a new and useful improvementin car-springs,and more specifically to that class of car -springs commonly calledhoused7 or ineased;77 and the invention consists in the construction,arrange- [5 ment, and combination of the parts, all as more fullyhereinafter described.

In the drawings which accompany this specification, Figure 1 is aperspective View of my improved car-spring. Fig. 2 isla vertical cenotral longitudinal section. Fig. 3 is a bottom plan of the top case. Fig.4 is a vertical een tral cross-section of a truck to which my carspringsare applied. Fig. 5 is a cross-section on line x x in Fig. 4.

2 5 A A are two sets of springs, each consisting of two or morecoilsprings concentrieall y placed within each other.

B and C are respectively the top and bottom of the inelosing-case7 thetop being made sufficiently larger to telescope the bottom. The case iscircularly rounded upon its ends, but is contracted in the middle, andsuitable round studs, D, are provided on the inside of the top andbottom to t into the eyes of the 3 5 inner coil-springs,and thereby hold the springs in position within the case.

E are stops at the rounding ends on the inside ofthe top of the ease.They do in no way interfere with the free telescopic action of the topcase, but are intended to form lateral stops to prevent end motion ofthe upper ends of the coil-springs.

The upper case, which has to be longer than the lower case on. accountof its being telescopic, cannot by itself prevent the side motion of thecoilsprings, as the lower case does, and therefore when under pressurethe upper ends of the coil-springs would be loose and have a free sideplay, and give to the ear 5o when running an undesirable swaying 1notion. This side motion is now prevented from taking place without undulyconfining the springs, and thereby subject the case to heavy strains orreduce the elasticity of the springs.

The object of using two sets of springs in a case contracted in themiddle will be apparent from Figs. 4 and 5, in which F is thetruck-frame; G, the swinging bolster, which bears the central pivot onwhich one end of the car rests; II, the suspension-bolster on 6o whichthe car-springs are supported, and I the hangers by means of which thesuspension-plate is supported from the truclcframe.

It is clear that, my case being contracted inh the center, larger andstronger springs can be used without interfering with the free play ofthe hangers than if the case were not contracted in the middle.

I am aware that it is not new in itself to contract cases Vin whichsprings are housed; 7e but I am not aware that such contraction has everbeen made in such a manner as to be of any use for the purpose abovestated.

In the present construction of freight ear trucks it is a standardconstruction to use the same arrangement of ooil-springs, exceptomitting the housing. Therefore my housed spring is especiallyserviceable and applica ble to make such car-trucks more suitable forrefrigerator-cars, in which the springs have to 8o be protected againstthe corrosive action of the refrigerating-mixtures.

What I claim as my invention is- I. In a car-spring, two sets ofcoil-springs, in combination with an inelosing telescopic case, eachpart of which is contracted in the middle between the two sets ofcoil-springs, substantially as described.

2. As a new article of manufacture in carsprings, two sets of springs,each composed of 9o two or more concentric coil-springs, aninclosing-case, cach part of which is contracted in the middle betweenthe two sets of springs, studs D, engaging into the eyes of the innercoilfsprings, and stops E in the top or larger part of the case, allarranged and combined substantially as described.

J AMES K. VOOLLEY.

vWitnesses:

H. S. SPRAGUE, CHARLns J. HUNT.

